ㆁ

Yennieung (letter: ; name: ) is an archaic consonant letter of the Korean alphabet, Hangul. It was associated with an voiced velar nasal sound. In Unicode, its name is spelled yesieung, following the ISO/TR 11941 romanization system. The letter is no longer used in modern Hangul orthographies. Its function gradually merged with that of the letter ; that letter now fulfills both their previous roles.

It has a stroke on top, added from , the null or zero initial. The relationship between these two characters is considered to be unusual, as they are of different sound classes of the Chinese linguistic system fanqie. Normally, strokes between Hangul letters to relate characters within the same sound class. They were considered to be related because an initial ng sound was a then-disappearing feature of the Chinese language. Ledyard argues that is unlikely to have ever been useful as an initial consonant for Korean, as that language likely never had an initial ng sound, and that it was mostly meant for representing Chinese. They were often confused, as they are so visually similar. In the 15th century, it was used in both as an initial and final consonant. It became final only at the start of the 16th century. By the 17th century, the two letters functionally merged into .